Drawing machine. Needle with string attached driven into wall establishs fixed viewpoint. Artist views object through sight attached to other end of the string. Artist views different points on object through sight and marks location on glass...

Drawing machine. Frame with grid between artist and object being drawn. Artist establishes viewpoint using a sight. Object as viewed by artist overlaid by grid in frame and divided into units. Image drawn on squared paper corresponding to grid...

Drawing machine. Frame with two movable threads crossing at right angles, paper on hinges. Needle in wall establishs fixed viewpoint. Weighted string with pin at end attached to needle. Pin held at various points on object and points where string...